Electronic sunglasses

Details Electronic sunglasses Electronic sunglasses

1990-04-16

1991-05-14

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

350331R, G02C 710

Patent

active

050150863

ABSTRACT:
Electronic sunglasses of the transmittance-varying type including liquid crystal panels employing the electro-optical effect and a solar cell used as a power source. The electronic sunglasses include a voltage detecting circuit having such a hysteresis characteristic so as to output a signal for changing transmittance of the liquid crystal panel from a high mode to a low mode at at least high predetermined voltage or illumination, and changing transmittance from a low mode to a high mode at at least a low voltage or illumination. The sunglasses also include a first switch which operates at at least two switch positions, one switch position having a first stage of illumination at less than 20,000 Lux and a second stage of illumination at 20,000 Lux or greater at which transmittance is changed from a high mode and another switch position disabling the voltage detecting circuit. Also included is a second switch which operates to change transmittance from a high mode to a low mode independently of the set voltage value in the voltage detecting circuit according to the hysteresis effect.

REFERENCES:
patent: 4279474 (1981-07-01), Belgorod
patent: 4968127 (1990-11-01), Russell et al.

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